First, you need python. You can download Python from its website: 

      https://www.python.org/ 



If you need to install NLTK, open the terminal and copy:

       pip3 install nltk
       python3
       import nltk
       nltk.download('all') 



If you need to install duckduckgo-images-api, open the terminal and digit:

       pip3 install duckduckgo-images-api



If you need to install DuckDuckGoImages, open the terminal and digit:

       pip3 install DuckDuckGoImages